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21. 发明授权

US06433838B1 Video signal processing method for improving the picture of dim area 有权
标题翻译：视频信号处理方法，用于改善暗区的图像
公开(公告)号：US06433838B1
公开(公告)日：2002-08-13
申请号：US09494909
申请日：2000-01-31
申请人： An-Tung Chen
发明人： An-Tung Chen
IPC分类号： H04N5202
CPC分类号： H04N5/202 , H04N9/69
摘要： A method of video signal processing that reduces computational and circuit costs. The method of processing a video signal of the present invention comprises the following steps: First, receiving a video input signal including an input luminance signal and input chrominance signals from a signal source. Next, correcting the input luminance signal of the video input signal to generate a corrected luminance signal. And finally outputting the corrected luminance signal and the input chrominance signals as the enhanced video signal to the subsequent video processor, such as a TV encoder, for converting the corrected signal from digital into analog. The correction of the luminance signal is accomplished by first normalizing the luminance signal by a predetermined value of a full-scale luminance. If the normalized luminance signal is greater than a first predetermined percentage, the corrected luminance signal is equal to the input luminance signal. If the normalized luminance signal is less than the first predetermined percentage and greater than a second predetermined percentage, the input luminance signal is corrected by non-linear correction to generate the corrected signal. If the normalized luminance signal is less than the second predetermined percentage, the input luminance signal is corrected by linear correction to generate the corrected luminance signal.
摘要翻译：一种减少计算和电路成本的视频信号处理方法。本发明的处理视频信号的方法包括以下步骤：首先，从信号源接收包括输入亮度信号和输入色度信号的视频输入信号。接下来，校正视频输入信号的输入亮度信号，以产生经校正的亮度信号。并且最后将经校正的亮度信号和输入色度信号作为增强视频信号输出到诸如TV编码器的后续视频处理器，用于将经校正的信号从数字转换为模拟。亮度信号的校正是通过将亮度信号标准化为满刻度亮度的预定值来实现的。如果归一化亮度信号大于第一预定百分比，则校正亮度信号等于输入亮度信号。如果归一化亮度信号小于第一预定百分比并且大于第二预定百分比，则通过非线性校正校正输入亮度信号以产生校正信号。如果归一化亮度信号小于第二预定百分比，则通过线性校正来校正输入亮度信号，以产生校正的亮度信号。

22. 发明授权

US06304300B1 Floating point gamma correction method and system 有权
标题翻译：浮点伽马校正方法及系统
公开(公告)号：US06304300B1
公开(公告)日：2001-10-16
申请号：US09191456
申请日：1998-11-12
申请人： David S. Warren , Andrew D. Bowen , David L. Dignam
发明人： David S. Warren , Andrew D. Bowen , David L. Dignam
IPC分类号： H04N5202
CPC分类号： H04N9/69 , G09G5/06 , G09G5/10 , G09G5/395 , G09G2320/0276 , H04N5/202
摘要： The present invention provides a method, a device, and a system for performing gamma correction on a set of pixel data based on a gamma correction curve table. The gamma correction curve table includes a specified total number of intensity levels associated with gamma corrected pixel values with one intensity level per pixel value. The method includes partitioning the gamma correction curve table into N segments such that each of the N segments is associated with a set of intensity levels from the specified total number of intensity levels. A plurality of intensity levels is selected for each of the N segments such that significant banding effects are not visible to the human eye between an adjacent pair of the selected intensity levels. The gamma corrected pixel values are stored for each of the N segments such that each of the plurality of selected intensity levels functions as an index to the associated gamma corrected pixel values. Gamma correction is performed on the set of pixel data by accessing a stored pixel value in one of the N segments in response to the pixel data to generate gamma corrected pixel data.
摘要翻译：本发明提供了一种用于基于伽马校正曲线表对一组像素数据执行伽马校正的方法，装置和系统。伽马校正曲线表包括与每个像素值具有一个强度水平的伽马校正的像素值相关联的指定的总数量的强度水平。该方法包括将伽马校正曲线表划分成N个段，使得N个段中的每一个与来自指定的强度水平总数的一组强度水平相关联。为N个片段中的每一个选择多个强度级别，使得显着的条带效应对于所选择的强度级别的相邻对之间的人眼是不可见的。为N个片段中的每一个存储伽马校正的像素值，使得多个所选择的强度级别中的每一个用作相关的伽马校正像素值的索引。通过响应于像素数据访问N段中的一个中存储的像素值来对像素数据集执行伽马校正，以产生伽马校正的像素数据。

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